Accumulators are used on systems that use an orifice tube to meter refrigerants into the evaporator. The accumulator is connected directly to the evaporator outlet and stores excess liquid refrigerant. The primary function of the accumulator is to isolate the compressor from any damaging liquid refrigerant. Like receiver driers, accumulators remove debris and moisture from the air conditioning system. Moisture is the prime enemy to your air conditioning system. When moisture mixes with refrigerant it forms a corrosive acid, which will destroy your compressor.